Re: [RFD hugetlbfs] strict accounting and wasteful reservations

['David Gibson' <david@gibson.dropbear.id.au>]

On Thu, Apr 13, 2006 at 03:06:44PM -0500, Adam Litke wrote:
> On Thu, 2006-04-13 at 21:01 +0100, 'David Gibson' wrote:
> > > We are thinking about switching the implementation of the ELF segment
> > > remapping code to store all of the remapped segments in one hugetlbfs
> > > file.  That way we have one hugetlb file per executable.  This makes
> > > managing the segments much easier, especially when doing things like
> > > global sharing.  When doing this, we'd like the file offset to
> > > correspond to the virtual address of the mapped segment.  So I admit
> > > that altering the kernel behavior helps libhugetlbfs, but I think my
> > > second justification above is even more important.  I like removing
> > > anomalies from hugetlbfs whenever possible.
> > 
> > Hrm... I'm not entirely convinced attempting to directly map vaddr to
> > file offset is a good idea.  But give it a shot, I guess.
> 
> It works, but just wastes a ton of huge pages in the process.

Just putting the various segments at consecutive offsets from the
beginning of the file wouldn't be that hard.  It might be a quicker
way forward than altering the kernel behaviour.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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